Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8ef9d3b2c8bd17f0b466292e62319e30a061b043e2986ca0b50e287d39c98b' 
  AND token = '1OI6yD2qQ0rGsoQLVr9cpg9ug5XncpFMCXTymX9H/uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}